Direct and indirect contact: Difference between revisions

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== Direct contact ==
 
{{Highlightbox|
Two measures of protection against direct contact hazards are often required, since, in practice, the first measure may not be infallible}}
 
A direct contact refers to a person coming into contact with a conductor which is live in normal circumstances (see {{FigRef|F2}}).
 
IEC 61140 standard has renamed “protection against direct contact” with the term “basic protection”. The former name is at least kept for information.
 
{{FigImage|DB422221_EN|svg|F2|Direct contact}}
 
== Indirect contact ==
 
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Standards and regulations distinguish two kinds of dangerous contact,
*Direct contact
*Indirect contact
and corresponding protective measures}}
 
An indirect contact refers to a person coming into contact with an exposed-conductive-part which is not normally alive, but has become alive accidentally (due to insulation failure or some other cause).
 
The fault current raise the exposed-conductive-part to a voltage liable to be hazardous which could be at the origin of a touch current through a person coming into contact with this exposed-conductive-part (see {{FigRef|F3}}).
 
IEC 61140 standard has renamed “protection against indirect contact” with the term “fault protection”. The former name is at least kept for information.
 
{{FigImage|DB422222_EN|svg|F3|Indirect contact}}
 
[[ru:Прямое и косвенное прикосновения]]
[[zh:直接接触和间接接触]]

Latest revision as of 20:03, 10 April 2018

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